Scanner with cuff-sheet type guiding structure comprising a first sheet disposed on a transparent platen that is thicker than a second sheet disposed on the transparent platen to form the cuff-sheet type guiding structure

Abstract

A scanner includes: a first body having a window and a guide structure; a transparent platen connected to the first body to cover the window; a first sheet disposed on the transparent platen and in the window; a second sheet fixedly disposed on the transparent platen, in the window and on the guide structure, wherein the first sheet is thicker than the second sheet to form a cliff-sheet type guiding structure as a first part of a transporting passage; a scanning module disposed in the first body; a second body having a second part of the transporting passage; and a transporting mechanism being disposed in the second body and transporting a document along the transporting passage, so that the scanning module scans an image of the document through the window.

What is claimed is: 
     
       1. A scanner, comprising:
 a first body having a window and a guide structure; 
 a transparent platen connected to the first body to cover the window; 
 a first sheet disposed on the transparent platen and in the window; 
 a second sheet fixedly disposed on the transparent platen, in the window and on the guide structure, wherein the first sheet and the second sheet are in physical surface contact with the transparent platen, so that the transparent platen provides physical surface supports to the first sheet and the second sheet, and the physical surface supports function in conjunction with a condition that the first sheet is thicker than the second sheet to form a cliff-sheet type guiding structure as a first part of a transporting passage; 
 a scanning module disposed in the first body; 
 a second body having a second part of the transporting passage; and 
 a transporting mechanism being disposed in the second body and transporting a document along the transporting passage, so that the scanning module scans an image of the document through the window. 
 
     
     
       2. The scanner according to  claim 1 , wherein the second body is pivotally disposed on the first body, and when the second body is opened or lifted from the first body, the second sheet does not move with movement of the second body. 
     
     
       3. The scanner according to  claim 1 , wherein the transparent platen is disposed on an inner surface of an edge part of the first body and a lower surface of the guide structure, and a step is formed between the first sheet and the edge part. 
     
     
       4. The scanner according to  claim 1 , wherein a gap is disposed between the first sheet and the second sheet, so that the scanning module scans the image of the document through the gap. 
     
     
       5. The scanner according to  claim 4 , further comprising a pressing element, which is elastically movably disposed in the second body, is disposed opposite the gap, and restricts the document from moving in a direction toward the pressing element. 
     
     
       6. The scanner according to  claim 4 , wherein the first body further has a second window, the guide structure is disposed between the window and the second window, and the transparent platen covers the second window. 
     
     
       7. The scanner according to  claim 6 , further comprising:
 a calibration sheet disposed on a lower surface of the guide structure and the transparent platen; and 
 a driving mechanism driving the scanning module to move to a location under the calibration sheet and to scan the calibration sheet for calibration, and then driving the scanning module to move to a location under the gap to scan the document. 
 
     
     
       8. The scanner according to  claim 7 , wherein the driving mechanism further drives the scanning module to move to a location under the second window to scan an image of a second document placed in the second window and on the transparent platen. 
     
     
       9. The scanner according to  claim 6 , wherein the guide structure comprises: a rising part, wherein the second sheet is partially disposed on the rising part; and a flat part connected to the rising part, and a height of the flat part ranges between a minimum height and a maximum height of the rising part. 
     
     
       10. The scanner according to  claim 9 , wherein an indication mark is disposed on the flat part to indicate a user to place a second document in the second window and on the transparent platen. 
     
     
       11. The scanner according to  claim 1 , wherein the first sheet is adjacent or close to the second sheet so that the scanning module scans the image of the document through the second sheet. 
     
     
       12. The scanner according to  claim 1 , wherein a height difference is formed between the first sheet and the second sheet, and when the document flies across the height difference, a part of the document, which is not in friction contact with the transparent platen, the first sheet and the second sheet, functions as an image acquiring region, so that the scanning module scans the image of the document through the image acquiring region.